STM32MP131FAF7T how to program PMIC

[T_Dodd]

I have a custom built  STM32MP131FAF7T board and can't set my VOUT2. The only line that is down is my VDD DDR Lines since I can't program my PMIC (STPMIC1DPQR) to have the VOUT2 to be 1.35 volts instead of 1.1 volts. My VCPU is at 1.2V, VDD is at  3.3V and VCORE is at 1.2V. 

[Olivier GALLIEN · Accepted solution]

Hi @T_Dodd ,

PMIC Buck2 is set and enable by TFA BL2 ( see  drivers/st/ddr/stm32mp1_ram.c:int stm32mp1_ddr_probe(void) ) in our delivery, following content of device tree node : 

pmic: stpmic@33 {

... 

vdd_ddr: buck2 {
   regulator-name = "vdd_ddr";
   regulator-min-microvolt = <1350000>;
   regulator-max-microvolt = <1350000>;
   regulator-always-on;
   regulator-over-current-protection;

   standby-ddr-off {
    regulator-off-in-suspend;
   };
  };

Did you properly set this node in your custom configuration ? 

Olivier